=over

=item HANDLE->format_top_name(EXPR)

=item $FORMAT_TOP_NAME

=item $^
X<$^> X<$FORMAT_TOP_NAME>

The name of the current top-of-page format for the currently selected
output channel.  The default is the name of the filehandle with C<_TOP>
appended.  For example, the default format top name for the C<STDOUT>
filehandle is C<STDOUT_TOP>.

Mnemonic: points to top of page.

=back